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Cancer Research Campaign Colorectal Tumour Biology Research Group, Department of Pathology and Microbiology, School of Medical Sciences, University of Bristol, Bristol BS8 1TD [A. C. W., T. J. C., M. M., C. P.], and Department of Surgery, Bristol Royal Infirmary, Bristol BS2 8HW [C. M. P., P. N., J. M. P. H.], United Kingdom
We investigated the expression of insulin-like growth factor binding
protein 3 (IGFBP-3) in normal human colonic epithelium and whether
IGFBP-3 is involved in the induction of apoptosis in colonic epithelial
cells. A gradient of IGFBP-3 protein expression was observed within the
normal colonic crypt, and increased IGFBP-3 expression was coincident
with the region of increased differentiation and apoptosis. Treatment
of human colonic tumor cell lines with IGFBP-3 alone was shown to have
no effect on growth. However, an increase in p53-dependent apoptosis
was observed in the presence of 100 ng/ml IGFBP-3 24 h after the
induction of DNA damage by
-irradiation. These results suggest that
IGFBP-3 enhances the p53-dependent apoptotic response of colorectal
cells to DNA damage.
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